DOS faces

As a DOS, you need a large repertoire of facial expressions for the
different situations you deal with each day. If a teacher tells you her
goldfish has died, for example, you must look terribly concerned, but
with a sort of grimace which means, “Don’t think that will get you out
of a full day’s teaching.”

It helps if you can practise these faces in the mirror at home. Here are some of the more common ones.